Round, Spiral & Oval Duct

A 45-degree spiral riser elbow has too little collar engagement and slips

A Vanstone flare tears on round duct

A flat-oval 45-degree fitting was made on the wrong bend axis

A high-velocity spiral 45-degree elbow slides off the collar

A round elbow heel seam blows open under high airflow

A round pipe only catches a tiny sleeve overlap

A spiral elbow collar is too short and slips apart

Around saddle tap not sealed

Branch tap installed facing wrong direction

Can a round pipe hanger be too tight?

Can a torn Vanstone flare be sealed with mastic?

Can you spin a flat-oval 45-degree elbow if the bend axis is wrong?

Coupler length not accounted for

Crimping a collar on spiral duct before confirming the duct gauge is compatible

Crushing spiral with strap or hanger

Cutting a round collar too large so it spins freely instead of gripping

Cutting spiral crooked and fighting the connection

Cutting spiral with grinder and leaving sharp burrs

Double-wall spiral liner crushes at a fitting

Elbow gore orientation wrong for available space

Enough hands for long spiral section not used

Exposed spiral appearance before final not checked

Failing to report a malfunctioning brake press rather than working around it

Finished or Painted Spiral Duct Was Scratched During Installation

Flat Oval Duct: Protect Shape and Use the Correct Joint System

Flat Oval Duct: Protect Shape and Use the Correct Joint System

Flat-oval duct seams split from heat expansion

Flat-oval spiral duct starts changing shape under pressure

Forgetting that a spiral round duct system needs a proper end cap at dead ends

Hanging spiral too low relative to ceiling grid

How much collar engagement does a spiral fitting need?

Installing round elbow in the wrong rotation

Missing insulation clearance around round duct

Mixed round duct gauge/connector style across system

Not communicating a discovered conflict to the foreman before working around it

Not deburring sharp spiral cut

Not identifying male/female end direction on spiral duct

Not using hearing protection around running equipment during testing

Pitch/slope on special exhaust round duct not checked

Producing flat oval duct that doesn't hold dimension after forming due to incorrect gauge selection

Proper lifting method for long spiral sections not used

Radius Elbow Vanestones

Radius Elbow Vanestones

Round Duct Saddle Tap Orientation

Round Duct Saddle Tap Orientation

Round Offset Cut Length After Fitting Takeoff

Round Offset Cut Length After Fitting Takeoff

Round Volume Dampers

Round Volume Dampers

Round pipe not fully seated before screwing

Round-to-rect transition orientation not checked

Round/spiral issue: when crushing spiral with strap or hanger

Round/spiral issue: when forgetting insulation clearance around round du

Round/spiral issue: when hanging spiral too low relative to ceiling grid

Round/spiral issue: when not checking pitch/slope on special exhaust rou

Round/spiral issue: when not sealing around saddle tap

Round/spiral issue: when not sealing spiral seam/joint after connection

Round/spiral issue: when not using saddle/band support where required

Round/spiral issue: when screws placed where they interfere with damper/

Round/spiral issue: when spiral run not level because hanger heights dif

Routing duct through a structural bay without engineering approval for the opening

Saddle tap is not sealed around the full perimeter

Saddle tap not sealed around full perimeter

Saddle/band support where required not used

Screws placed where they interfere with damper/blade/access

Screws were driven into the spiral lockseam

Spiral Duct Gasket Installation

Spiral Duct Gasket Installation

Spiral diameter before grabbing coupling not checked

Spiral duct is out of round and the coupling will not seat

Spiral pipe starts bulging or unzipping at the lockseam

Spiral run not level because hanger heights differ

Spiral seam/joint after connection not sealed

Stabilize Round Duct Before Starting Screws or Clamps

Starting spiral run without verifying centerline

Supporting Round Duct

Supporting Round Duct

Takeoff cut hole too large or ragged

Too few screws around round joint

Wearing loose clothing or jewelry around rotating machinery or sharp edges

Why are loop hangers buckling round spiral duct?

Why are thin hanger straps slicing into round duct?

Why can a concentric reducer cause water pooling in round duct?

Why can an adjustable round elbow split open on a high-velocity duct run?

Why did a spiral duct reducer separate during startup?

Why did the flat-oval longitudinal seam open on warm air discharge?

Why did the gasket get shaved off a spiral slip joint?

Why did the inner liner buckle when installing double-wall spiral duct?

Why did the round volume damper blade get stuck in spiral duct?

Why did the spiral 45-degree elbow slide off its collar during testing?

Why does round duct need enough sleeve overlap before screwing?

Why does spiral duct drift side-to-side in teardrop hangers?

Why is a short-radius 45-degree elbow hurting fan performance?

Why is air leaking from the spiral lockseam during a pressure test?

Why is flat-oval duct deforming on a flat Unistrut support?

Why is flat-oval spiral duct bowing or pancaking under static pressure?

Why would spiral duct bulge or unzip at the lockseam under pressure?

Wrong band/clamp size for round duct